The 1250 Double Bow Stranding Machine is a critical piece of equipment in the cable manufacturing industry, specifically designed for the efficient, uniform, and high-precision helical stranding of multiple single wires (such as copper/aluminum conductors or fiber optic units). Its core lies in its unique mechanical structure, which ensures balanced tension and precise lay length for each individual wire during high-speed operation, thereby producing cable cores with stable structure and superior electrical performance. As one of the flagship products of Jiangsu Newtopp Precision Machinery Co., Ltd., the 1250 Double Bow Stranding Machine embodies the company's profound technical expertise and manufacturing craftsmanship in the field of high-end cable equipment.
Core Design Principles and Technical Highlights
1. Double Bow Pay-Off System
This is the origin of the model's name and its core advantage over traditional stranding machines. The two symmetrical bow-shaped cradles, through precise synchronous control, achieve the following key performances:
| Traditional Single Bow/Non-Bow Stranders |
1250 Double Bow Stranding Machine |
| Wire tension may be uneven, affecting stranding roundness. |
Double bow synchronous compensation ensures highly consistent tension across all wires, resulting in tight stranding without gaps. |
| High inertia during high-speed operation can cause vibration and wire breakage. |
Excellent dynamic balance ensures smooth operation, significantly reducing vibration and wire stress, suitable for high-speed continuous production. |
| Long downtime for bobbin change or troubleshooting. |
Ergonomic design facilitates operation and maintenance, reducing unplanned downtime and improving overall production efficiency. |
2. Efficient Stranding and Precise Control
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High Capacity: Designed to strand up to 1250 units or more (depending on wire diameter), meeting the cable core manufacturing needs for large cross-section, multi-core cables.
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Precise Lay Length: Utilizes advanced mechanical transmission or servo control systems, offering stable, adjustable, and highly repeatable lay length, fully compliant with various cable standards (e.g., UL, CE, VDE).
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High Speed: The optimized double bow design reduces rotating mass, allowing for higher mechanical speeds while maintaining quality, thereby increasing output.
As a National High-Tech Enterprise, Newtopp's R&D team has integrated years of experience with cage and tubular stranders into the double bow design, combining the efficiency of high-speed stranders with the precise tension control of cage stranders.
Primary Application Areas
The 1250 Double Bow Stranding Machine is widely used in cable types requiring high-quality stranded conductors:
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Data Communication Cables: Pair twisting or core stranding for Cat5e, Cat6, Cat7, etc.
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Power Cables: Conductor stranding for low to medium voltage power cables.
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Specialty Cables: Precision stranding for robot cables, automotive wiring harnesses, new energy (photovoltaic, charging pile) cables, and industrial bus cables.
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Other Wire Materials: Stranding for telephone cords, audio cables, and various metallic materials.
Leveraging its experience in providing complete production line equipment for data cables, industrial cables, and robot cables, Newtopp ensures that the 1250 Double Bow Stranding Machine works in perfect synergy with upstream and downstream equipment (such as Newtopp's extruders and taping machines), forming highly efficient production lines.
Equipment Selection and Maintenance Guide
1. Key Parameters for Selection Reference
| Parameter |
Description & Considerations |
| Applicable Wire Diameter Range |
Confirm the diameter range of single wires to be stranded, ensuring machine compatibility. |
| Max. Number of Stranding Units |
Select based on maximum core count requirement of your products (e.g., 1250 type). |
| Lay Length Range |
Verify it covers the lay length requirements for all your product specifications. |
| Max. Spindle Speed |
Directly impacts production efficiency; balance with machine stability. |
| Pay-Off Bobbin Size |
Match existing tooling and material specifications to minimize additional investment. |
| Tension Control Method |
Mechanical friction, magnetic particle brake, or servo motor; varies in precision and cost. |
2. Key Points for Routine Maintenance
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Regular Lubrication: Lubricate moving parts like gearboxes and bearings strictly according to the manual.
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Cleaning: Promptly remove metal chips and dust inside the machine to prevent accuracy loss.
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Tension System Inspection: Regularly calibrate and inspect tension control mechanisms to ensure responsive and accurate performance.
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Mechanical Fastening Check: Check for loose bolts at all connection points, especially on high-speed rotating parts.
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Electrical System Check: Inspect the working status of sensors, brakes, PLC, and other electrical components.
Jiangsu Newtopp Precision Machinery Co., Ltd. not only provides high-quality 1250 Double Bow Stranding Machines but also offers comprehensive operator training, detailed maintenance manuals, and long-term spare parts support to ensure the equipment maintains optimal performance throughout its lifecycle.
Frequently Asked Questions (FAQ)
Q1: What are the main differences between a Double Bow Strander, a Tubular Strander, and a Cage Strander?
A1: The core differences lie in the pay-off system and tension control. Tubular stranders have stationary bobbins, suitable for low-speed, coarse stranding. Cage stranders have bobbins rotating with the cage, offering good tension control for precise multi-layer stranding but with speed limitations. The 1250 Double Bow Stranding Machine's dual-cradle structure is an efficient compromise. It offers better tension control and higher speed than tubular stranders, and a simpler, more maintainable structure compared to high-speed cage stranders, making it particularly suitable for high-speed, precise stranding of medium-diameter wires in high counts.
Q2: How to prevent excessive internal torsional stress or springback in the stranded conductor?
A2: This is precisely the essence of the 1250 Double Bow Stranding Machine. The symmetrical design of its double bows and the precise synchronization system ensure nearly identical tension for all wires at the convergence point. Newtopp's design optimizes the guide wheel path and take-up angle, minimizing unnecessary bending stress, fundamentally preventing the accumulation of internal stress and product springback caused by uneven tension or over-deformation.
Q3: How does your equipment ensure compatibility with existing production lines?
A3: As a full-chain supplier covering R&D, design, and manufacturing, Jiangsu Newtopp Precision Machinery Co., Ltd. deeply understands the importance of production line synergy. We offer flexible interface customization (electrical signals, mechanical dimensions, speed matching, etc.), ensuring the 1250 Double Bow Stranding Machine can be seamlessly integrated into customers' existing production lines or new lines composed of other Newtopp equipment (like extruders, taping machines), enabling intelligent and continuous production.
Q4: What is the lifespan of key components, and are they easy to replace?
A4: Newtopp insists on using high-quality bearings, gears, and electrical components. Key mechanical parts are strengthened and precision-machined for long service life. Meanwhile, the equipment features a modular design, with wear parts and maintenance points easily accessible for simple replacement. The company's bases, such as the one in Kunshan, ensure the rapid supply of genuine spare parts and technical support.
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